Finrot is a common bacterial disease of fish kept in low quality water conditions.

It is caused by gram negative bacteria like Aeromonas, Pseudomonas, or Vibrio which eats the delicate membranes of fish. Usually the area of the damaged fin becomes opaque and white then is eaten away by the bacteria. Often fungus develops giving the wound a fluffy appearance. It is easily treated and the fin will grow back if not too badly damaged.

Tail Rot is named thus as it it appears initially in the tail (caudal) region

Gill Rot is named thus as it it appears initially in the Gill region as white patches.